53 lines
2.3 KiB
Python
53 lines
2.3 KiB
Python
# (c) Copyright 2016 Hewlett Packard Enterprise Development LP
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib.api import extensions
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from neutron_lib.plugins import directory
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def get_agent_types_by_host(context, host):
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"""Return the agent types registered on the host."""
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agent_types = []
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core_plugin = directory.get_plugin()
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if extensions.is_extension_supported(core_plugin, 'agent'):
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agents = core_plugin.get_agents(
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context.elevated(), filters={'host': [host]})
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agent_types = [a['agent_type'] for a in agents]
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return agent_types
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def is_driver_compatible(context, driver, interface, host_agent_types):
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"""True if the driver is compatible with interface and host_agent_types.
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There may be edge cases where a stale view or the deployment may make the
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following test fail to detect the right driver in charge of the bound port.
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"""
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# NOTE(armax): this logic stems from the fact that the way Neutron is
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# architected we do not have a univocal mapping between VIF type and the
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# Driver serving it, in that the same vif type can be supported by
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# multiple drivers. A practical example of this is OVS and OVN in the
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# same deployment. In order to uniquely identify the driver, we cannot
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# simply look at the vif type, and we need to look at whether the host
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# to which the port is bound is actually managed by one driver or the
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# other.
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is_interface_compatible = driver.is_interface_compatible(interface)
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# For an agentless driver, only interface compatibility is required.
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if not driver.agent_type:
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return is_interface_compatible
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# For an agent-based driver, both interface and agent compat is required.
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return is_interface_compatible and driver.agent_type in host_agent_types
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